STLU-G Series Vortex Flow Meters

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Silver Automation Instruments has launched the STLU-G Series Vortex Flow Meters, which represent a significant technological advancement compared to traditional flow meters. This series of Vortex flow meters stands out as one of the most advanced vortex flow meters in the Chinese market. The STLU-G Series offers cutting-edge features and capabilities that set it apart from conventional flow meters, making it a top choice for high-end applications. With its innovative design and superior performance, these vortex flow meters provide accurate and reliable flow measurements, catering to the needs of various industries and applications.

Outstanding Features of STLU-G Series Vortex Flow Meters

High accuracy : Liquid accuracy ±0.5~ ±1.5%, gas accuracy ±0.5~ ±2.5%,
High temperature option max to 500°C
High pressure constructions max to 450 bar
Large turn down ratio, standard 8:1~20:1, max 30:1 or higher.
Min liquid velocity can be 0.21 m/s, and gas velocity can be even lower to 1.98 m/s
Low Pressure Loss
On-site flow sensor replacement without stopping the flow

Overview

The new generation of isolated and seismic-resistant inductive vortex flowmeter is a world-leading milestone in the history of vortex flowmeters. The flowmeter housing adopts an integral structure, which is sturdy, without sealing parts, installation screws, or leaks, ensuring safety and reliability. It is equipped with isolation and allows for on-site sensor replacement without stopping the flow. The sensor has excellent seismic resistance, as well as high pressure and high temperature performance. The transmitter is equipped with advanced electronic signal spectrum scanning and processing circuits, further optimizing seismic resistance. It offers precise measurement, wide range, low minimum flow rate, safety, reliability, low operating costs, and minimal pressure loss. This product has a wide range of applications and has become a truly "universal flowmeter". The isolated and seismic-resistant inductive vortex flowmeter is sure to be favored by designers, specifiers, and a wide range of users.

Principle

The inductive vortex flowmeter is a volumetric flowmeter that operates based on the principle of the Karman vortex street. Inside the flowmeter housing, there is a triangular prism called the bluff body. When the fluid flows past the bluff body, low-pressure zones are formed on both sides of the bluff body, creating regular vortices alternately on each side, known as Karman vortices. As shown in Figure 1.1, the vortices are asymmetrically arranged downstream of the bluff body. The flow velocity and volumetric flow rate of the vortex flowmeter are directly proportional to the frequency of the vortices. It is mainly used for measuring the flow of industrial pipeline fluids, such as gases and vapors. It has a small size, a wide range of measurement, high accuracy, and is almost unaffected by parameters such as fluid density, pressure, temperature, and viscosity when measuring volumetric flow rates. It has no moving mechanical parts, resulting in high reliability and low maintenance requirements. The instrument parameters can remain stable for a long time.

Given: Vortex frequency f, average fluid velocity V, bluff body width d, flowmeter inner diameter D, the relationship can be derived as follows:

f = St * V / [(1-1.25*d/D)*d]

Where:

f: Vortex frequency

V: Fluid flow velocity

d: Width of the bluff body

D: Inner diameter of the flowmeter

St: Strouhal number

Schematic diagram of the working principle of Karman vortex flow meter

Technical Specifications

Process fluids	Liquids, Gas and Steam.
	Saturated steam can be regarded as single-phase fluid when its dryness is greater than 85%
Process temperature	Standard: -40～+250°C~350°C						Extended:>+350°C~500°C
Pressure rating	Standard:≤2.5MPa～4.0Mpa						Extended:>4.0MPa~45MPa
Accuracy	Liquid:	±0.5%	±1.0%				±1.5%
	Gas:	±0.5%	±1.0%				±1.5%	±2.5%
Turndown	Standard:8:1~20:1					Extended:≥30:1
Reynolds number	Standard:2x10⁴~7x106					Extended:1x104~7x106
Flow velocity	Liquid:0.21~7.6m/s Gas/steam standard velocity range：2~76m/s, extended <1.98m/s
Resistance factor	Full pipe type：Cd ≤2.4
Permitted max. vibration acceleration	0.5g-1.5g
Straight pipe length	Upstream straight pipe length ≥ 20D Downstream straight pipe length ≥ 5D
Pressure loss	△P=1.29ρV2 ρ:density (kg/m3)，V:velocity(m/s)
Minimum upstream pressure (liquids)	Pmin≥2.7ΔP+1.3P0 P0: liquid vapor pressure at operating conditions (Pa)
Protection rating	Standard: IP65				Extended: IP68
Ex mark	Intrinsically safe type: Ex ia IIC T1~T4 Ga
Ambient conditions	Ambient temperature			-40~+55°C non-explosion-protected areas
				-20~+55°C explosion-protected areas
	Relative humidity			non-condensing
	Atmospheric pressure			86~106kPa
Power supply	Pulse: 12VDC~+24VDC Current:+24VDC 4-20mA Battery: 3.6V
Power	<1w
Output signals	Frequency/pulse output: 2~3,000Hz low level ≤1V high level ≥5V
	2 wires, 4~20mA output: For exploration-protected type, load resistance ≤300Ω For non-exploration-protected type, load resistance ≤500Ω
Display	Flow rate, volume flow, flow unit, flow percentage, etc.
Communication protocol	HART、Modbus RTU(RS485)
Electrical Conduit	M20*1.5 (F)
	1/2”-14 NPT (F)
Body & bluff body	Standard Material：304 SS

Model Selection

Mark
STLU	Silver Automation Instruments Vortex Flow meter
Code	Working Principle
G	Isolated type Karman Vortices Flowmeter
Code	Process Connection
1	Flanged(DN50~DN300)
2	Wafer type (DN15~DN300)
3	Fixed Inserted
4	Adjustable Inserted (without Ball Valve)
5	Adjustable Inserted (with Ball Valve)
6	Tri-clamp
7	Thread ( please specify thread standard)
Code	Measured Fluid
2	Liquid
3	Gas
4	Steam
Code	Nominal Diameter
015	15mm	05		50mm		15	150mm
020	20mm	06		65mm		20	200mm
02	25mm	08		80mm		25	250mm
03	32mm	10		100mm		30	300mm
04	40mm	12		125mm		Others	Inserted ≥250mm
Code	Indicator
D	With Digital Indicator
N	No Indicator ( 3 wire, pulse frequency output)
Code	Power Supply
1	24V DC
2	3.6V Lithium Battery
Code	Output Signal
0	No output
1	Pulse Output
2	Two Wire :4~20mA DC
4	Hart Protocol
5	RS-485 (Modbus)
Code	Fluid Temperature
1	Standard -40~250°C
3	High Temperature Type :+100~+350°C
4	High Temperature Type :+350~+500°C
2	Specify
Code	Pressure Rating
Code	Standard		Code		Standard	Code		Standard
G0	GB 1.0Mpa		D0		DIN PN10	A1		ANSI Class 150
G1	GB 1.6Mpa		D1		DIN PN16	A2		ANSI Class 300
G2	GB 2.5 Mpa		D2		DIN PN25	A3		ANSI Class 600
G3	GB 4.0 Mpa		D3		DIN PN40	S		Special
Code	Explosion Proof
N	Non
d	Flameproof
i	Intrinsically Safe
Code	Flow Meter Construction
0	Compact display
1	Remote display ,specify cable length
Code	Protection Level
0	IP65
1	IP67
2	IP68
Code	Compensation
B0	Non compensation
BT	Built-in temperature compensation
BP	Built-in pressure compensation
BPT	Built-in temperature and pressure compensation
EPT	External temp & pressure compensation (RTD, pressure transmitter and flow totalizer)
EP	External pressure compensation (pressure transmitter and flow totalizer)
ET	External Temperature compensation (pressure transmitter and flow totalizer)
Code

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